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https://issues.apache.org/jira/browse/HADOOP-7529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13083285#comment-13083285
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Todd Lipcon commented on HADOOP-7529:
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+1, I verified that with this patch, the jcarder cycle disappears. And the
patch looks reasonable, though I don't know this area of the code well.
> Possible deadlock in metrics2
> -----------------------------
>
> Key: HADOOP-7529
> URL: https://issues.apache.org/jira/browse/HADOOP-7529
> Project: Hadoop Common
> Issue Type: Bug
> Components: metrics
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Luke Lu
> Priority: Critical
> Fix For: 0.23.0
>
> Attachments: hadoop-7529-v1.patch, metrics-deadlock.png
>
>
> Lock cycle detected by jcarder between MetricsSystemImpl and
> DefaultMetricsSystem
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